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How to add multiple outlets for generated DSL XText

By default, the created XText artifacts generate code from my DSL into a standard socket (by default, this is the src-gen folder). I know that you can explicitly pass the output configuration name to fsa.generateFile ("myfile.txt", "MY_OUTLET_NAME", "Some file contents").

I need me to generate the code using DSL XText and want to use the generation break pattern and generate the code in a folder called "src-once".

I am using XText 2.2.1.

My questions:

1) Where and how to define my output points, for example, "MY_OUTLET_NAME"?

2) Is there a way to prevent overwriting existing files in a specific outlet?

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2 answers

IOutputConfigurationProvider

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. , .

MyOutputConfigurationProvider, IOutputConfigurationProvider. getOutputConfigurations : src-gen src-gen-once .

package com.my.dsl;

import static com.google.common.collect.Sets.newHashSet;

import java.util.Set;

import org.eclipse.xtext.generator.IFileSystemAccess;
import org.eclipse.xtext.generator.IOutputConfigurationProvider;
import org.eclipse.xtext.generator.OutputConfiguration;

public class MyOutputConfigurationProvider implements
    IOutputConfigurationProvider {

public final static String DEFAULT_OUTPUT_ONCE = "DEFAULT_OUTPUT_ONCE";

/**
 * @return a set of {@link OutputConfiguration} available for the generator
 */
public Set<OutputConfiguration> getOutputConfigurations() {
    OutputConfiguration defaultOutput = new OutputConfiguration(IFileSystemAccess.DEFAULT_OUTPUT);
    defaultOutput.setDescription("Output Folder");
    defaultOutput.setOutputDirectory("./src-gen");
    defaultOutput.setOverrideExistingResources(true);
    defaultOutput.setCreateOutputDirectory(true);
    defaultOutput.setCleanUpDerivedResources(true);
    defaultOutput.setSetDerivedProperty(true);

    OutputConfiguration onceOutput = new OutputConfiguration(DEFAULT_OUTPUT_ONCE);
    onceOutput.setDescription("Output Folder (once)");
    onceOutput.setOutputDirectory("./src-gen-once");
    onceOutput.setOverrideExistingResources(false);
    onceOutput.setCreateOutputDirectory(true);
    onceOutput.setCleanUpDerivedResources(false);
    onceOutput.setSetDerivedProperty(true);
    return newHashSet(defaultOutput, onceOutput);
}

}

MyOutputConfigurationProvider, :

/**
 * Use this class to register components to be used within the IDE.
 */
public class MyDslUiModule extends com.my.dsl.ui.AbstractMyDslUiModule {
public MyDslUiModule(AbstractUIPlugin plugin) {
    super(plugin);
}

@Override
public void configure(Binder binder) {
    super.configure(binder);

    binder.bind(IOutputConfigurationProvider.class).to(MyOutputConfigurationProvider.class).in(Singleton.class);
}

}

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